$Dytes taczanowskii Wolters,1975-82,Die Vogelarte der Erde,p.16.
upland lakes in foothill mesetas,500-1200m;breeds on small or medium-sized lakes where shallow water allows floating carpets of water weeds;non-breeders occur on larger lakes
"Laying in Dec/Jan, sometimes Feb." (HBW,1,p.195)
Migratory.Much movement of flocks between lakes during summer;numbers vary from day to day,suggesting birds move at night.Birds leave before lakes freeze over in May. Probably winter near breeding areas on lakes too large to freeze over.